How to update multiple invoices at once in BUSY for GST purposes?

You need to follow below steps to update multiple invoices in BUSY 
 Step 1: Go to administraion and Bulk Updation.
 Step 2: Click on bulk voucher creation and modification.
 Step 3: After clicking on bulk voucher creation and modification select voucher type for Example-sales.
 Step 4: After that select voucher type and click on configure for creating bulk voucher creation modification format.
 Step 5: Select vouher type and add format.
 Step 6: After create the format, you can see the format below the concerned voucher type by click on voucher type.
 Step 7: After select the format click on configure and you will get the prompt for load default components that will be use in voucher creation after click on Yes button.
 Step 8: Then you can select field as per your requirements and save the configuration.
 Step 9: If you want to create any master of account and item used in voucher then can tick on Create New Master Used in Vouchers in master creation info field and enter all required details like, Master Group, Tax Category, Hsn Code etc.
 Step 10: Click on all required feild that want to pick from item master and for auto calculation and then click on update button at then bottom side.
 Step 11: Enter date in field for instance, voucher date , voucher no ,Party name , Items details etc.
 Step 12: At last click on save button at bottom of the window and your vouchers will be created in bulk.
 Note - Do the same process for all type of voucher.